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  • 2000-2004  (4)
  • 1980-1984  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of custom tray material type and fabrication technique on tensile bond strength of impression material adhesive systems (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  The purpose of this investigation was to evaluate the tensile bond strengths of two impression material systems (polysulphide and polyvinyl siloxane) to two custom tray materials [autopolymerizing and visible light-cured (VLC) acrylic resin]. The effect of polymerizing the tray materials directly against wax spacer and tinfoil was evaluated for each material. Polymerizing tray materials against tinfoil significantly increased the bond strengths of polysulphide and polyvinyl siloxane impression materials to VLC and autopolymerizing acrylic resin tray materials. Polyvinyl siloxane VLC cured against tinfoil combination produced the strongest bond. The VLC resin tray material generated greater bond strength than autopolymerizing acrylic resin when polymerized against tinfoil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01023.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Size at birth of live-born Saudi infants (1984)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 91 (1984), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Anthropometric measurements were done on 967 singleton live-born Saudi infants of gestational age 33 to 42 weeks who belonged to the high and middle social classes and who were born consecutively in Riyadh University Hospital. The 914 infants born at term (≥37 weeks) had a mean birthweight of 3.31 kg (SD 0.45), a mean length of 49.74 cm (SD 2.5) and a mean head circumference of 34.4 cm (SD 1.4). Values were significantly higher in males than females. Effect of sex in this study was not apparent until 40 weeks and later. Difference in body size was significant between the first-born and second infants but the trend was unimpressive with greater parity. Fifty-three (5.5%) of the infants were born preterm. Twenty-one of the preterm babies and 18 of the term infants weighed 〈2500 g, an overall incidence of low birthweight of 4%. Results were compared with studies from Saudi Arabia and other countries. It is concluded that there was no significant difference between birthweights of upper-class Saudis and Europeans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1984.tb04737.x
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  • 3
    Electronic Resource
    Electronic Resource
    OPTIMIZATION OF CAROTENE RECOVERY FROM HYDROLYZED PALM OLEIN IN ADSORPTION COLUMN CHROMATOGRAPHY USING RESPONSE SURFACE METHODOLOGY (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food lipids 11 (2004), S. 0 
    Details
    ISSN: 1745-4522
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Response Surface Methodology (RSM) for optimization of carotene recovery from hydrolyzed palm olein (HCPOlein) in adsorption chromatography was carried out. The level and interaction of three independent variables was investigated: column temperature (50 to 60C), oil loading (25 to 200 g), and mobile phase flow rate (6 to 60 mL/min). Based on the response as percentage of carotene recovery from 50 g of HP-20 adsorbent, the optimum conditions were achieved at 200 g of oil loading, column temperature at 55C, and flow rate at 33 mL/min. Up to 98% of carotene recovery was obtained under these conditions. Interaction of oil-oil, oil-flow rate and flow rate-flow rate could enhance the percentage of carotene recovery. However, oil and flow rate as single factors could significantly reduce percentage of carotene recovery. Oil loading as a single factor could positively influence the amount of carotene adsorbed. However, flow rate as a single factor and oil-oil interaction could negatively influence the amount of carotene adsorbed. The mean of difference (MD) of the experimental and predicted data for percentage of carotene recovery and the amount of carotene adsorbed were very small, −0.0067 and 0.0133, respectively. The probability (P) value showed no significant lack-of-fit for both equations in this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4522.2004.tb00259.x
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  • 4
    Electronic Resource
    Electronic Resource
    RECOVERY OF PALM CAROTENE FROM PALM OIL AND HYDROLYZED PALM OIL BY ADSORPTION COLUMN CHROMATOGRAPHY (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food lipids 9 (2002), S. 0 
    Details
    ISSN: 1745-4522
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Crude palm oil and crude palm olein were hydrolyzed with lipase from Candida rugosa to produce a free fatty acid (FFA) rich oil. The percentages of FFA produced and carotene degradation after the hydrolysis process were determined. The palm oil and hydrolyzed palm oil were subsequently subjected to column chromatography. Diaion HP-20 adsorbent was used for reverse phase column chromatography at 50C. Isopropanol or ethanol, and n-hexane were used as the first and second eluting solvents, respectively. The objective of hydrolyzing the palm oil was to produce more polar FFA-rich oil in order to enhance the nonpolar carotene bind to the nonpolar HP-20 adsorbent in the column chromatography process. Hydrolyzing palm oil with lipase from Candida rugosa gave 30- and 60-fold, respectively, of FFA in the crude palm oil and crude palm olein in 24 h at 50C. Approximately, 15.56 and 17.48% of carotene degraded in crude palm oil and crude palm olein, respectively. For column chromatography, using isopropanol or ethanol as the first eluting solvent, unhydrolyzed oil and hydrolyzed oil showed the carotene recovery infraction two (carotene-rich fraction) of about 36–37 and 90–96%, respectively. Over 90% of carotene recovery was obtained from
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4522.2002.tb00211.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cluster structure of 16O (2003)
    Springer
    The European physical journal 18 (2003), S. 65-73 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A folding potential describing the $\alpha$ -scattering on 16O over a broad energy range 25.8-146.0 MeV is constructed on the basis of $\alpha$ -like cluster and unclustered-nucleon configurations of 16O. The resulting potential does not need any renormalization to fit the angular distribution of elastic cross-sections. The effects of the repulsive part of $\alpha$ - $\alpha$ and $\alpha$ -nucleon interactions are investigated. The analysis suggests that both the $\alpha$ - $\alpha$ repulsive potential and the unclustered nucleonic configuration in the target are important to describe the scattering data over a broad range of incident energies. The root-mean-square radius for the 16O nucleus is deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10168-7
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Polychlorinated biphenyls in the sediments of the inner Oslofjord (1982)
    Springer
    Water, air & soil pollution 18 (1982), S. 485-497 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Sediment cores (16) from the Inner Oslofjord were analyzed for PCB's and DDT. Although localized high content of PCB's is observed, the data show even distribution of these compound — a consequence of removal by particulate and detrital matter and the sedimentation of this material. Significant modification of the profiles of PCB's in the sedimentary column together with fractionation of the PCB's according to their chlorine content are observed. The extent of these changes is shown to be related to the physico-chemical conditions in the sediments and hence the extent of biological mediation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02426056
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  • 7
    Electronic Resource
    Electronic Resource
    Thermostimulated depolarization currents on a glass surface in ambient gases (1983)
    Springer
    Journal of materials science 18 (1983), S. 2544-2554 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Interdigital comb-shaped electrodes were used to observe thermostimulated depolarization currents flowing on a soda glass surface in ambient gases. The experimental set up, electrode shaping by photograving and measurement procedure are described. Surface thermostimulated depolarization current (STDC) spectra were recorded on glass specimens in dioxide carbon or helium. In both cases, after short gas residence times, depolarization currents were not different from those obtained in vacuum. Different STDC spectra were recorded as the residence time of a glass specimen in CO2 was increased; these spectra also changed with polarization time and polarization temperature. In helium, STDC peaks were observed at −110
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547570
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Trace elements in human fingernails: Measurement by proton-induced X-ray emission (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 82 (1984), S. 111-124 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The method of proton particle-induced X-ray emission (proton PIXE) has been employed to study the trace element composition of human fingernails. The samples were colleted from 51 subjects randomly selected from a working community of about 500 adults and they were analyzed by the thick-target external beam technique of the PIXE method. The samples were exposed to the proton beam as 1-mm thick pellets and irradiated with 2 MeV protons having 20 nA beam intensity. For 40 μC irradiations, the concentration of fourteen elements, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Rb, Sr and Pb, were measured by comparison with a calibration obtained from the NBS orchard leaf standard (SRM 1571). Some anomalous cases have been revealed from this study and they are attributed to environmental factors. The frequency distributions of the elements are presented and the results compared with available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227334
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Ecological studies of Cladocera in the ricefields of Tanjung Karang, Malaysia, subjected to pesticide treatment (1984)
    Springer
    Hydrobiologia 113 (1984), S. 99-103 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; ricefield Cladocera ; pesticide effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Temporal changes in the population densities of four dominant Cladocera (Moina micrura, Diaphanosoma excisum, Alona guttata and Macrothrix spinosa) were studied in untreated and pesticide treated rice plots over a growing season. M. micrura was the first dominant species to occur in all the plots which were initially devoid of vegetation except for the newly transplanted rice seedlings. With the growth of the rice seedlings and the appearance of aquatic macrophytes, open water ricefields were transformed into vegetated littoral conditions precipitating the disappearance of M. micrura and the appearance of the littoral A. guttata and M. spinosa, and the eurytopic D. excisum. The cladoceran community was affected by spraying of the pesticide FMC35001, an analogue of Furadan®. The response of the four dominant species to the pesticide treatment is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026596
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